M32CSLASH86 datasheet(261/505 Pages) RENESAS

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Page 238

18. A/D Converter

)

(

Figure 18.2 AD0CON0 Register

Function

A/D0 Control Register 0(1)

Bit Name

Bit

Symbol

Address

After Reset

AD0CON0

039616

0016

CH0

CH1

CH2

Analog Input Pin

Select Bit(2, 3, 8, 9)

(i=none, 0, 2, 15)

MD0

MD1

TRG

CKS0

ADST

A/D Operating Mode

Select Bit 0(2, 6, 7)

A/D Conversion

Start Flag

Trigger Select Bit

Frequency Select

Bit

0 : Software trigger

1 : External trigger, hardware trigger(4)

0 : A/D conversion stops

1 : A/D conversion starts(4)

(Note 5)

0 0 : One-shot mode

0 1 : Repeat mode

1 0 : Single sweep mode

1 1 : Repeat sweep mode 0 or 1

b1b0

0 0 0 : ANi0

0 0 1 : ANi1

0 1 0 : ANi2

0 1 1 : ANi3

1 0 0 : ANi4

1 0 1 : ANi5

1 1 0 : ANi6

1 1 1 : ANi7

NOTES:

1. When the AD0CON0 register is rewritten during the A/D conversion, the conversion result is

indeterminate.

2. Analog input pins must be set again after changing an A/D operating mode.

3. The CH2 to CH0 bit settings are enabled in one-shot mode and repeat mode.

4. To set the TRG bit to "1", select the cause of trigger by setting the TRG0 bit in the AD0CON2 register.

Then set the ADST bit to "1" after the TRG bit is set to "1".

frequency must be under 16 MHz when VCC=5V.

Combination of the CKS0, CKS1 and CKS2 bits selects

6. When the MSS bit in the AD0CON3 register is set to "1" (multi-port sweep mode enabled), set the

MD1 and MD0 bits to "102" to enter multi-port single sweep mode and to "112" to enter multi-port

repeat sweep mode 0.

7. When the MSS bit is set to "1", the MD1 and MD0 bits cannot be set to "002" or "012".

8. AVCC=VREF=VCC, AD input voltage (for AN0 to AN7, AN00 to AN07, AN20 to AM27, AN150 to AN157,

ANEX0, ANEX1)

≤ VCC.

9. Set the PSC_7 bit in the PSC register to "1" to use the P10 pin as an analog input pin.

The CKS0 Bit in the

AD0CON0 Register

The CKS1 Bit in the

AD0CON1 Register

The CKS2 Bit in the

AD0CON3 Register

fAD

divided by 4

fAD

divided by 3

fAD

divided by 2

fAD

divided by 8

fAD

divided by 6

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